#include <stdio.h>

namespace sg
{
	class Person
	{
	public :
		void run()
		{
			printf("I can running\n");
		}
	};

	class LiuXiang : public Person
	{
	public :
		void run()
		{
			printf("I can running more faster than others\n");
		}
	};
}

int main()
{
	sg::Person p1;
	p1.run();
	
	sg::LiuXiang liu_xiang;
	liu_xiang.run();
}
